air mass inflow meter on 1998 Mercedes-Benz CLK320

how much should i pay for a air mass flow meter on a 1998 Mercedes-Benz clk 320

Asked by for the 1998 Mercedes-Benz CLK320
Mercedes list price is $380; the Bosch number is 0280217515 and is the exact same part. my shop will not
warranty any air mass meter unless the air filter is replaced.